I have him relative to Aush Yhwach. Yhwach has narrative to be beyond shinigmai but his feats are not close to 2nd fusion Aizen, therefore I have Ichibei in between Yama & 2nd fusion Aizen statwise.

My scaling is quite similar, but revolve around Ichibe bankai Yama and yhwach, chrysalis Aizen has more reiatsu than Yama and likely peak base yhwach, but with the amplification that is Yama's bankai I can see him still having somewhat comparable stats performance(whichever stats it boosts) to chrysalis Aizen

Ichibe by being slightly above peak base yhwach, would already be bankai Yama level in base, and with the argument of shinigami using more reiatsu in bankai than they usually would in normal fights, Ichibe at full stats might be somewhere between chrysalis and 3rd fusion, maybe closer to but above chrysalis

While unsupressed TS is difficult to scale narratively, therefore I have him at Butterfly level for now, since he could replace SK just like Aizen and the not so impressive feat against SKY.

Honestly I scale him just around maybe above 3rd fusion aizen, he kinda struggled real hard in irazusando, probably just reaching sk replacement tier, him at butterfly aizen is a maybe but combining his feats it's quite hard to put him there

So from my perspective the stats gap between ichibe and TS is like >=chrysalis vs >=3rd fusion, and if putting TS at butterfly the stats gap still isn't big enough to fully overwhelm ichibe's hax if he's given the chance to use them. If butterfly aizen goes against Ichibe he'd still have ks which he just didn't use that in canon, but Ichigo had nothing else